JP2002359330A - Heat sink clamping fitment, heat sink and method for fixing heat sink - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a heat sink of one embodiment to be variably used, thereby sufficiently satisfying when minimum embodiments are prepared as much as possible, and to enable a heat sink manufacturing cost and an installation cost to be reduced. SOLUTION: A leaf spring type clamping fitment 1 comprises a pressing part 10, a bending part 22, and a fixing part 12 to be mounted on the heat sink having an insertion part made of stretching parts to be inserted with the pressing part 10 of the fitment 1 between arbitrary fins of a plurality of fins arranged in rows. In this case, a width of the part 10 is formed longer than a gap between the stretched parts and shorter than a distance between the fins. A width of the part 11 is formed in a length of the gap between the stretched parts. The part 10 can be inserted into the insertion part. The part 11 is freely erectable from the gap between the stretched parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for fixing a heat sink for cooling a semiconductor element to a substrate.

[0002]

2. Description of the Related Art Conventionally, as a method of fixing a heat sink to a substrate, a fixing tool such as a terminal or a leaf spring is used.

FIG. 15 shows a fixing method using the terminals 6. In this method, as shown in FIG. 16, the heat sink 2 is provided with an insertion portion comprising an overhang portion 22 between arbitrary fins 21. 17, one terminal 6 has an L-shaped end surface as shown in FIG. 17, and a retaining piece 61 is provided on one side serving as a mounting portion 60, and a fitting insert 62 is provided on the other side serving as a fixing portion. The terminal 6 is mounted on the heat sink 2 by inserting the mounting portion 60 from the heat sink insertion portion 20 and, as shown in FIG. Once it has been fitted into the
Fixation is performed (8 in FIG. 18 is a semiconductor element).

On the other hand, FIG. 19 shows a fixing method using the leaf spring-type fixing tool 9. The leaf spring-type fixing tool 9 includes a pressing portion 90 for pressing the heat sink 2 'by elastic deformation, and two ends. Bending part 91 where elastic deformation occurs due to bending
And a fixing portion 92 at the tip of the bent portion.
In a state where the pressing portion 90 is applied between the fins 21 of the 2 ′, the bending portion 91 is fixed to the substrate 7 at the fixing portion 92 while bending the bending portion 91 as shown in FIG. An engaging portion 93 is formed by bending in the portion 92,
The locking portion 93 that is about to spread due to the elastic reaction force is
It is a structure that is fixed by being locked to the outside of
The heat sink 2 'is pressed and fixed to the substrate 7 (in the figure, reference numeral 8 is a semiconductor element). However, in such a mode, the position of the pressing portion 90 of the fixing tool 9 is easily shifted when the fixing member 9 is mounted on the heat sink 2 ′. Therefore, as shown in FIG. 21 and FIG. There is also a device for performing processing (FIG. 21 shows a half-punch caulking portion X, and FIG. 21 shows a squeezing positioning portion Y) to position the fixture 9.

[0005]

However, using the terminal 6 or the leaf spring type fixing tool 9 as described above, the heat sink 2,
In the method of fixing 2 ′, there was only a slight difference in the basic shape of the heat sink, so that a heat sink had to be prepared for each of the fixing tools 6 and 9. FIG. 23 shows the end faces of both heat sinks 2 and 2 ′, respectively.
Is for a terminal, and FIG. 14B is for a spring-type fixture. In the case of using the terminal 6, if the insertion portion 20 including the overhang portion 22 is not formed between any fins 21, it cannot be mounted there,
For this reason, the heat sink 2 'shown in FIG. Conversely, as shown in FIG. 2A, when such an insertion portion 20 is formed, the pressing portion 90 of the leaf spring-type fixing device 9 cannot be mounted from above, and in any case, the terminal The heat sink 2 shown in FIG.
9, and conversely, it is impossible to fix the heat sink 2 ′ shown in FIG.

The places where the fixtures 6 and 9 are attached are formed in the form of the heat sinks 2 and 2 ′ (in addition to the shape and dimensions, particularly in the case of the terminal 6, the place where the insertion portion 20 is formed, the leaf spring mold 9).
In the case of, it is determined by the positioning processing location X, Y), so if there is a part or wiring pattern at the location on the substrate 7 where the terminal 6 to be mounted or the tip of the leaf spring mold 9 is located, As a result, the heat sinks 2, 2 'could not be used in that location.

Therefore, conventionally, a large number of types of heat sinks are used depending on the conditions of the fixtures 6 and 9 and the substrate 7 to be used.
It is necessary to prepare it as appropriate, as well as the trouble of preparation,
The manufacturing costs and installation costs have also been enormous.

The present invention has been made in view of the above-mentioned problems of the prior art, and makes it possible to use heat sinks of one form in various ways, thereby preparing the smallest possible form of heat sink. It is an object of the present invention to provide a heat sink fixing technique capable of reducing the manufacturing cost and the installation cost of the heat sink as well as reducing the cost.

[0009]

Therefore, the invention of claim 1 according to the present invention aims to achieve the above object by improving the fixing tool, and has the following configuration. That is, the fixing device is mounted on a heat sink in which a plurality of fins are arranged in a row and a pressing portion of the fixing device is inserted between arbitrary fins, and an insertion portion formed of an overhang portion is formed. A leaf spring-type fixing tool comprising a pressing portion, a bent portion, and a fixing portion, wherein the pressing portion width is formed to be longer than the gap between the overhang portions and shorter than the distance between the fins. The width of the bent portion is formed to be equal to or less than the gap between the overhanging portions, and the pressing portion is freely inserted into the insertion portion, and the bent portion is formed between the overhanging portions. It is characterized in that it can be freely raised from the gap.

According to the present invention, a leaf spring-type fixing device is improved so that it can be used as a fixing device for a heat sink which is conventionally fixed only by terminals. In the present application, the pressing portion of the leaf spring refers to a portion that comes into contact with and presses the heat sink (for example, 10 shown in FIG. 1), and the bending portion is a portion connected to the pressing portion and is elastic by bending. The portion that deforms (for example, 11 shown in the figure), and the fixing portion refers to the portion that is fixed to the substrate (for example, 12 shown in the drawing).

In the fixing device according to the present invention, the width of the pressing portion is formed to be longer than the gap between the overhanging portions and shorter than the distance between the fins, and the width of the bending portion is adjusted to the distance between the overhanging portions. It is formed to have a length equal to or less than the gap, and the bent portion is raised from the gap between the overhanging portions while inserting the pressing portion into the insertion portion. While bending, bending the bent portion and fixing the fixed portion to the substrate, the pressing portion presses the heat sink toward the substrate side by elastic deformation of the bent portion,
Thereby, the heat sink is fixed. That is, a leaf spring-type fixing device can be used as a fixing device for a heat sink having a terminal fixing insertion portion.

On the other hand, the invention according to claim 2 of the present application aims to achieve the above object by improving a heat sink, and has the following configuration. That is, in the heat sink, in a heat sink in which a plurality of fins are arranged in a row, a pressing portion of a fixture is inserted, and an insertion portion formed from an overhang portion is formed between the plurality of fins. It is a feature.

A heat sink according to the present invention is an improved heat sink having an insertion portion for mounting a terminal-type fixture, and the insertion portion is formed between a plurality of fins. For this reason, when the terminal is to be fixed to the substrate at one insertion portion, if there is a component or a wiring pattern at the position of the terminal tip and the terminal cannot be fixed, another terminal that is not affected by such an interfering object is used. What is necessary is just to fix a terminal in an insertion part. Of course, the plate spring-type fixing device of claim 1 can be used for the heat sink according to the present invention, and the same effect can be obtained even when the fixing device is used.
In addition, in order to expand the range of selection of the fixing device mounting portion and maximize the effect, a mounting portion may be formed between all the fins.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described with reference to the drawings. It should be noted that the following embodiments are merely examples, and the invention according to the present application is not limited to the embodiments.

FIGS. 1 and 2 show a leaf spring type fixing device according to a first embodiment. FIG. 1 shows the fixing device itself, and FIG. 2 shows a heat sink fixed state by the fixing device.

The fixing device 1 of this embodiment is composed of a leaf spring in which one elongated metal plate is bent as appropriate, and is bent from a central flat pressing portion 10 and an end portion of the pressing portion 10. The bent part 11 bent back from the place, and a screw hole 13 at the tip of the bent part 11
And a flat fixing portion 12 provided with a.

The heat sink 2 to be fixed by the fixing tool 1 has a form to be fixed by a conventional terminal. That is, a plurality of fins 21 are arranged, and an insertion portion 20 including an overhang portion 22 is formed between arbitrary (here, the center) fins 21a and 21b. To describe the insertion portion 20 in more detail, the projecting portions 22a and 22b extend slightly upward from the base ends of the fins 21a and 21b toward the opposing fins 21a and 21b, respectively. The width is about 1/6 between the fins 21a and 21b, and a gap is formed between the tips of the overhangs 22a and 22b. Such fins 21a and 21b and the overhang 22a , 22b and fin 21
The space defined by the upper surface of the heat sink between a and 21b is the insertion portion 20.

The width of each part 10, 11, 12 of the fixture 1 is set based on the dimensions of the insertion part 20 of the heat sink 2. That is, the width of the intermediate portion of the pressing portion 10 is
It is formed longer than the gap between the overhanging portions 22 and shorter than the distance between the fins 21 (this portion is also referred to as a wide portion), and the width of the pressing portion end 10a and the width of the bent portion 11 and the fixing portion 12
The width is formed to be shorter than the gap between the overhang portions 22.

Therefore, as for the fixture 1, if the pressing portion 10 is inserted into the insertion portion 20 of the heat sink 2 along the length direction thereof, the width of the bent portion 11 becomes Since the gap is equal to or less than the gap, the pressing portion 10 is inserted into the insertion portion 20 formed by the fin 21, the overhang portion 22, and the upper surface of the heat sink without interfering with the overhang portion 22 with the bent portion 10 standing up. And can be pressed as shown in FIG.
10 is an arbitrary position of the heat sink 2 (here, almost at the center)
At this point, if the fixing portion 12 is screwed to a substrate (not shown), the pressing portion 10 presses down the heat sink 2 by the elastic deformation of the bending portion 11, whereby the fixing to the substrate can be performed. That is, the fixture 1 can be used as an object to be fixed to the heat sink 2 which cannot be fixed by the conventional leaf spring-type fixture (for example, 9 shown in FIG. 19).

FIG. 3 shows a fixture 1 'of the second embodiment. This fixture 1 'is basically a form in which a predetermined length at the center of the pressing portion 10 of the fixture 1 of the first embodiment is cut off and divided into two right and left fixture pieces 1a and 1b. Accordingly, each of the fixture pieces 1a and 1b has a pressing portion 10 on one end side, a fixing portion 12 on the other end side, and a bending portion 11 in the middle. This embodiment is shown in FIG.
As shown in (1), a single fixture 2 is formed by a pair of fixture pieces 2a and 2b, and a pair of fixture pieces 1a and 1b are mounted on the same insertion portion 20. For this reason, the fixing tool 1 of the first embodiment has substantially the same operation and effect as the fixing tool 1 of the first embodiment. On the side)
There is an advantage that the fixing position 1 '(the screw fixing position of each fixing portion 12) can be freely changed.

In both of these embodiments, when the fixtures 1 and 1 'shown in FIGS. 2 and 4 are mounted, the protruding portion 22 located above the pressing portion 10 is caulked, and the pressing portion 10 is caulked. It can be fixed to the upper surface of the heat sink. In other words, the fixing tools 1 and 1 'can be positioned by caulking the overhang portion 22, and processing for positioning (half punching shown in the X section in FIG. 21 or Y section in FIG. It is not necessary to separately apply a hole for squeezing positioning shown in FIG.

When the pressing portion 10 is swaged, the fixing device 1
As shown in FIG. 5, a notch 14 is formed at the center of the wide portion of the pressing portion 10 of the fixing tool 1 in order to increase the retaining strength of the fixing member 1 (the same applies to the second embodiment), or FIG.
As shown in the figure, as a caulking jig 5,
Those in which 0 is formed may be used.

FIG. 7 shows a heat sink 3 according to a third embodiment. The heat sink 3 of the present embodiment is basically in a form substantially similar to the heat sink 2,
The heat sink 2 has an insertion portion 20 having a central fin 21.
While the heat sink 3 is formed only between the a and 21b, the heat sink 3 of the present embodiment is different in that the projecting portion 32 extends between all the fins 31 and the insertion portion 30 is formed. .

For this reason, the heat sink 3 of this embodiment is
A fixing device can be inserted into the insertion portion 30 between any of the fins 31. When the fixing device is inserted into one of the insertion portions 30 and is to be fixed, there is no component or wiring pattern in the fixing portion of the fixing device. If it is not possible to fix it, it is possible to select another insertion portion 30 which is not affected by such an interference object, and insert a fixing tool there and fix it. For example, when it is difficult to attach the fixing device to the center insertion portion 30, FIG.
As shown in FIG. 9 and FIG. 9, it is sufficient to mount it on another mounting part 30, and the position of the fixing tool (terminal in these figures) can be appropriately changed according to the condition of the substrate (not shown). That is, according to the heat sink 3, it can be fixed to the substrate in any situation without being affected by other interference objects. Further, as shown in FIG. 10, the entire shape can be reduced by cutting at the insertion portion 30 unit.
It is possible to more flexibly cope with various substrates. Note that, since the insertion portion 30 is formed, the fixing device for the heat sink 3 can use a conventional terminal (for example, 6 shown in FIG. 17), as well as the plate of the first embodiment. The spring-type fixing device 1 can be used, and a fixing device 15 as shown in FIG. 11 can also be used. By the way, FIG. 12 is a view of the mounting state of the fixing tool 15, and this fixing tool 15 is a second embodiment of FIG. , But differs in that the width of the bent portion 17 is not narrower than the gap between the overhangs. This is because, in the fixture 15, the entire bent portion 17 is arranged on the side of the heat sink 2. Therefore, the length of the bent portion 17 has to be shortened, and the amount of elastic deformation is somewhat reduced. Therefore, it is preferable to use the heat sink for fixing the heat sink, which is allowed even if the pressing force due to the elastic deformation is somewhat weak.

Further, the heat sink 3 of this embodiment has a plurality of insertion portions 30, so that a fixing method as shown in FIG. 13 can be adopted. In this fixing method, any one of the fixing tool 1 and the terminal of the first embodiment can be used, but in the present embodiment,
As shown in FIG. 14, a leaf spring-type fixing tool 4 having a fixing portion 42 provided only on one end side is used. This fixture 4
The width dimension of each of the portions 40, 41, and 42 corresponds to the insertion portion 3 of the heat sink 3.
Fixture 1 of the first embodiment in that it is set based on the dimension of 0
That is, the width of the pressing portion 40 is longer than the gap between the overhanging portions 32 and shorter than the distance between the fins 31, and the width of the bending portion 41 and the width of the fixing portion 42 are between the overhanging portions 32. It is formed to have a length less than the gap. On the other hand, it is common to the second embodiment in that the fixing portion 42 is located on one end side and the pressing portion 40 is located on the other end side, but is different from the second embodiment in that one fixing tool is not divided. That is, the fixing device 4 of the present embodiment is
This is a mode in which only one is attached to the insertion part 30 of the first embodiment. The pressing portion 40 of the fixture 4 includes a locking piece 44 projecting downward at an end and a pair of left and right retaining pieces 45 extending outward from the fixing portion 42 toward the pressing portion 40. It is slightly raised in two places. With this retaining piece 45,
When the fixing portion 42 is inserted into the insertion portion 30 of the heat sink 3, it cannot be moved in the reverse direction of the insertion, the removal can be prevented, and the locking piece 44 contacts the end of the heat sink insertion portion 30. Since it is locked, the fixing tool 4
Is fixed. In this state, if a screw is fitted into a screw hole of the fixing portion 42 and screwed onto a substrate (not shown), the heat sink 3 is fixed. However, since the fixing device 4 is fixed to the substrate only on one side of the heat sink 3, the same fixing device 4 is attached to the other insertion portion 30 from the opposite direction and fixed on the substrate on the other side of the heat sink 3. For example, the fixing devices 4 are mounted in opposite directions, and the fixing portions 42 are fixed on either side of the heat sink 3, and as a result, the heat sink 3 is stably fixed.

The fixing method shown in FIG. 13 has the advantage that the selection of the fixing portion of the fixing tool 4 is broadened and the influence of the interference around the heat sink is not so large. There is a greater advantage in that it can sufficiently cope with the space saving required in the above. That is, circuit elements and the like are mainly provided on the substrate on which the heat sink is disposed, and it is required that the installation space including the height of other devices such as the heat sink be minimized. For this reason, the size and height of the heat sink itself must be limited. By the way, the plate-spring-like fixing device presses the heat sink against the substrate by the pressing portion by the elastic deformation of the bent portion. If the height and length of the bent portion are not certain, predetermined elastic deformation occurs. (Strictly speaking, if the length is long, the height does not need to be high, and if the height is high, the required elastic deformation can be secured even if the length is short, but any dimension is made larger. There is a need). Then, if a leaf spring-type fixing device is used for a heat sink whose height and length are limited, the length and height of the fixing device are also restricted. Elastic deformation cannot be obtained, and eventually, it is possible that the spring-like fixing device cannot be used. However, the fixture 4 shown in FIG.
Since one end is a pressing portion 40 and the other end is a fixing portion 42, the length of the bent portion 41 (B2 shown in FIG. 6B) is the same as that of the both-end fixing portion type (for example, FIG. 1B). Since the length is twice or more as compared with B1) shown in the figure, sufficient elastic deformation can be secured, and therefore, it can be sufficiently used as a fixture even for a space-saving heat sink having a reduced height and length. It will be.

[0027]

As described above, according to the heat sink fixing device and the heat sink according to the present invention, it is possible to use the heat sink in one form variously, thereby preparing the minimum possible form. It is enough.

[0028] Therefore, compared to the conventional case,
The heat sink manufacturing cost and the installation cost are significantly reduced.

[Brief description of the drawings]

FIG. 1 shows a leaf spring type fixing device of a first embodiment,
(a) is a plan view, and (b) is a front view.

FIGS. 2A and 2B show a mounting state of the fixture of FIG. 1 to a heat sink, wherein FIG. 2A is a plan view, FIG. 2B is a front view, and FIG.

3A and 3B show a leaf spring fixing device according to a second embodiment, and FIG.
Is a plan view, and (b) is a front view.

4A and 4B show a mounting state of the fixture of FIG. 3 to a heat sink, wherein FIG. 4A is a plan view, FIG. 4B is a front view, and FIG.

FIG. 5 is a plan view showing an improved type of the first embodiment for improving the retaining strength of the pressing portion.

FIGS. 6A and 6B show an embodiment of a caulking jig for improving the retaining strength of the pressing portion, wherein FIG. 6A is a front view of a tip and FIG. 6B is a side view thereof.

FIGS. 7A and 7B show a heat sink according to a third embodiment, and FIG.
Is a plan view, and (b) is a side view.

FIG. 8 is a plan view showing an example of a fixed form of the third embodiment.

FIG. 9 is a plan view showing another example of the fixed form of the third embodiment.

FIG. 10 is a plan view showing a fixed form of a third embodiment in which the whole shape is cut by cutting.

11A and 11B show an example of a fixture to which the heat sink of the third embodiment can be fixed, wherein FIG. 11A is a plan view and FIG. 11B is a front view.

12A and 12B show a mounting state of the fixture of FIG. 11 to a heat sink, wherein FIG. 12A is a plan view and FIG. 12B is a front view.

FIGS. 13A and 13B show a form in which a particularly remarkable effect is recognized among the fixed forms of the third form example, where FIG. 13A is a plan view, FIG. 13B is a front view, and FIG. 13C is a side view.

FIG. 14 shows a leaf spring-type fixing device used in the drawing, and (a)
Is a plan view, and (b) is a front view.

15 (a) is a plan view, FIG. 15 (b) is a front view, and FIG. 15 (c) is a side view.

16A and 16B show a heat sink fixed by a conventional terminal, wherein FIG. 16A is a plan view and FIG. 16B is a side view.

17A and 17B show a conventional terminal, wherein FIG. 17A is a plan view, FIG. 17B is a front view, and FIG. 17C is a side view.

FIG. 18 is a front view showing a mounting state of a heat sink fixed by a conventional terminal.

19 (a) is a plan view, FIG. 19 (b) is a sectional view taken along line AA in FIG. 19 (a), and FIG. 19 (c) is a side view.

FIG. 20 is a front view showing a mounted state of a heat sink fixed by a conventional leaf spring-type fixing device.

FIGS. 21A and 21B show a heat sink fixed state in which a leaf spring type fixing tool is positioned by half punch caulking, wherein FIG. 21A is a plan view and FIG. 21B is a sectional view taken along the line AA in FIG.

FIG. 22 shows a heat sink fixed state in which the leaf spring-type fixing tool is positioned by squeezing positioning;
(a) is a plan view, and (b) is a sectional view taken along the line AA in (a).

FIG. 23 shows a conventional heat sink in comparison.
(a) is a front view of the heat sink fixed by the terminal, (b) is a front view of the heat sink fixed by the leaf spring type fixing device.

[Explanation of symbols]

 1,1 ', 4 Leaf spring type fixture 2,2', 3 Heat sink 6 Leaf spring type fixture (conventional structure) 7 Substrate 8 Semiconductor element 9 Terminal 20,30 Insertion part 21,31 Fin 22,32 Overhang Department

Claims (3)

[Claims] 1. A plurality of fins are arranged in a row, and a pressing portion of a fixing tool is inserted between arbitrary fins, and is attached to a heat sink having an insertion portion formed of an overhang portion. A pressing portion, a bent portion, and a leaf spring-type fixing device including a fixing portion, wherein the pressing portion width is formed to be longer than the gap between the overhang portions and shorter than the distance between the fins. The bent portion width is formed to a length equal to or less than the gap between the overhanging portions, and the pressing portion is freely inserted into the insertion portion, and the bent portion is moved from the gap between the overhanging portions. A heat sink fixture characterized in that it can be started up freely. 2. A heat sink in which a plurality of fins are arranged in a row, wherein an insertion portion formed by an overhang portion, into which a pressing portion of a fixing tool is inserted, is formed between the plurality of fins. And heat sink. 3. A method for fixing a heat sink to the heat sink according to claim 2 by using the fixing tool according to claim 1, wherein the fixing tool according to claim 1 has a bent portion only on one side of the pressing portion. And the form in which the fixing portion is formed
The heat sink fixing method as described above, wherein the fixing devices are mounted in different insertion portions and in opposite directions so that the fixing portions are fixed to either side of the heat sink. Method.